package com.zh.netty.codec;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.CharsetUtil;

/**
 * @Description: netty 客户端handler
 * @ClassName NettyClientHandler
 * @date: 2021.01.24 15:41
 * @Author: zhanghang
 */
public class NettyClientHandler extends ChannelInboundHandlerAdapter {
    // 当通道就绪就会触发该方法
    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
//        super.channelActive(ctx);
        System.out.println("====client ctx:" + ctx);
        // 发送消息给服务器
        ctx.writeAndFlush(Unpooled.copiedBuffer("hello,server: 喵", CharsetUtil.UTF_8));
    }

    // 当通道有读取事件时触发
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
//        super.channelRead(ctx, msg);
        ByteBuf buf = (ByteBuf) msg;
        System.out.println("===服务器回复的消息："+buf.toString(CharsetUtil.UTF_8));
        System.out.println("===服务器的地址："+ctx.channel().remoteAddress());
    }

    // 发生异常时触发
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
//        super.exceptionCaught(ctx, cause);
        ctx.close();
    }
}
